net: use NETDEV_TX_OK instead of 0 in ndo_start_xmit() functions

This patch is the result of an automatic spatch transformation to convert
all ndo_start_xmit() return values of 0 to NETDEV_TX_OK.

Some occurences are missed by the automatic conversion, those will be
handled in a seperate patch.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tulip/de2104x.c b/drivers/net/tulip/de2104x.c
index 81f054d..769af55 100644
--- a/drivers/net/tulip/de2104x.c
+++ b/drivers/net/tulip/de2104x.c
@@ -651,7 +651,7 @@
 	dw32(TxPoll, NormalTxPoll);
 	dev->trans_start = jiffies;
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /* Set or clear the multicast filter for this adaptor.